1. A toy rocket, weighing 10N blasts straight up from groundlevel with a kinetic

Question

1. A toy rocket, weighing 10N blasts straight up from groundlevel with a kinetic energy of 40J. At the exact top of itstrajectory, its total mechanical energy is 140J. To what verticalheight does it rise? a.) 10m b.) 14m c.) 24m d.) none of the above 2. Does the centripetal force acting on an object do work onthe object? a.) yes, since a force acts and the object moves, and work isforce times distance b.) yes, since it takes energy to turn an object c.) no, because the object has constant speed d.) no, because the force and the displacement of the objectare perpendicular. 1. A toy rocket, weighing 10N blasts straight up from groundlevel with a kinetic energy of 40J. At the exact top of itstrajectory, its total mechanical energy is 140J. To what verticalheight does it rise? a.) 10m b.) 14m c.) 24m d.) none of the above 2. Does the centripetal force acting on an object do work onthe object? a.) yes, since a force acts and the object moves, and work isforce times distance b.) yes, since it takes energy to turn an object c.) no, because the object has constant speed d.) no, because the force and the displacement of the objectare perpendicular.

Explanation / Answer

1. Em=KE+PE or PE=Em-KE=140-40=100J, and PE=mgh then100J=10N(h) and h=10 m 2. Since the force and displacement are perpendicular there is nowork done.

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